Schema Stitching. Combining multiple schemas into one

If I have the following two remote GraphQL schemas:
```
type Event {
date: String
location: String
}

Query {
event(date: String): Event
}
```
```
type Weather {
temperature Int
condition String
windSpeed: Int
}

Query {
forecast(location: String): Weather
}
```
I should be able to stich them toghether and perform the following query:

```
query GetEvent($date: String) {
event(date: $date) {
location {
temperature
}
}
}
```